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ENGLISH 和京香长得差不多的女优Chasing operations being lathe work, and involving no principles not already noticed, what is said further will be in reference to die-cutting or bolt-threading machines, which, simple as they may appear to the unskilled, involve, nevertheless [144] many intricacies which will not appear upon superficial examination.

The first and, perhaps, the most important matter of all in founding engineering works is that of arrangement. As a commercial consideration affecting the cost of manipulation, and the expense of handling material, the arrangement of an establishment may determine, in a large degree, the profits that may be earned, and, as explained in a previous place, upon this matter of profits depends the success of such works.2. The connection between the hammer drop and valve cannot be positive, but must be broken during the descent of the drop.

If dies are fixed, the clamping mechanism to hold the rods has to run with the spindle; such machines must be stopped while fastening the rods or blanks. Clamping jaws are usually as little suited for rotation on a spindle as dies are, and generally afford more chances for obstruction and accident. To rotate the rods, if they are long, they must pass through the driving spindle, because machines cannot well be made of sufficient length to receive long rods. In machines of this class, the dies have to be opened and closed by hand instead of by the driving power, which can be employed for the purpose when the dies are mounted in a running head.It may be noticed that all machines, except milling machines, which act in straight lines and produce plane surfaces have reciprocating movement; the class includes planing, slotting and shaping machines; these, with lathes, constitute nearly the whole equipment of an ordinary fitting shop.

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The safety, simplicity, and reliable action of hydraulic machinery has already led to its extensive employment for moving and lifting weights, and it is fair to assume that the importance and success of this invention fully entitle it to be classed as one of the most important that has been made in mechanical engineering during fifty years past. The application of hydraulic force in operating the machinery used in the processes for steel Bessemer manufacture, is one of the best examples to illustrate the advantages and principles of the hydraulic system. Published drawings and descriptions of Bessemer steel plant explain this hydraulic machinery. CHAPTER I

Forging relates to shaping metal by compression or blows when it is in a heated and softened condition; as a process, it is an intermediate one between casting and what may be called the cold processes. Forging also relates to welding or joining [77] pieces together by sudden heating that melts the surface only, and then by forcing the pieces together while in this softened or semi-fused state. Forging includes, in ordinary practice, the preparation of cutting tools, and tempering them to various degrees of hardness as the nature of the work for which they are intended may require; also the construction of furnaces for heating the material, and mechanical devices for handling it when hot, with the various operations for shaping, which, as in the case of casting, can only be fully understood by experience and observation.52

Of course I did not allow the little girl to go by herself, but took her with me. It was a wearying expedition in the excessive heat of that day. Very soon the child was no longer able to carry her small belongings, and, though already sufficiently loaded myself, I had to take her bundle as well. She was scarcely able to walk more than a thousand yards at a stretch, and had then to sit down on the grass by50 the roadside and rest. She did not quite understand what was going on, but she had an undefined feeling of fear on that long, deserted road, where we did not meet anybody except some well-hidden or stealthily moving German patrols who suddenly pointed their rifles at us.

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For the rest of the journey I used my only remaining means of transport, my legs, and after a walk of some hours got to the frontier of The Netherlands near Oud-Vroenhoven. A Netherland custom-house officer asked for my papers, and I showed him my huge passport. The man looked at the sheet critically, and made out that I could not possibly be a Netherlander, as I was the holder of a "foreign" passport.4. The speed at which shafts should run is governed by their size, the nature of the machinery to be driven, and the kind of bearings in which they are supported.In order to examine once more the state of affairs around Lige, I decided to pay another visit to that town.

CHAPTER IVThe duration of the war has more or less surprised me, and I postponed writing this book for a long time as I wished to quote the evidence of persons in high places, clergymen, and educated foreigners. As the war is not over yet, I must omit these in the interest of their safety.3. The course or direction of transmission, whether in straight lines or at angles.

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